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/**
* Copyright (C) 2013 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#pragma once
#include <iosfwd>
#include <string>
#include "mongo/base/string_data.h"
#include "mongo/db/namespace_string.h"
#include "mongo/platform/hash_namespace.h"
namespace mongo {
/**
* Representation of names of various kinds of resources targetable by the access control
* system.
*
* Three of the types of name, "forDatabaseName", "forExactNamespace" and "forClusterResource",
* can represent concrete resources targeted for manipulation by database operations. All of
* the types also act as patterns, useful for matching against groups of concrete resources as
* part of the access control system. See buildResourceSearchList() in
* authorization_session.cpp for details.
*/
class ResourcePattern {
public:
/**
* Returns a pattern that matches absolutely any resource.
*/
static ResourcePattern forAnyResource() {
return ResourcePattern(matchAnyResource);
}
/**
* Returns a pattern that matches any database or collection resource except collections for
* which ns.isSystem().
*/
static ResourcePattern forAnyNormalResource() {
return ResourcePattern(matchAnyNormalResource);
}
/**
* Returns a pattern that matches the "cluster" resource.
*/
static ResourcePattern forClusterResource() {
return ResourcePattern(matchClusterResource);
}
/**
* Returns a pattern that matches the named database, and NamespaceStrings
* "ns" for which ns.isSystem() is false and ns.db() == dbname.
*/
static ResourcePattern forDatabaseName(StringData dbName) {
return ResourcePattern(matchDatabaseName, NamespaceString(dbName, ""));
}
/**
* Returns a pattern that matches NamespaceStrings "ns" for which ns.coll() ==
* collectionName.
*/
static ResourcePattern forCollectionName(StringData collectionName) {
return ResourcePattern(matchCollectionName, NamespaceString("", collectionName));
}
/**
* Returns a pattern that matches the given exact namespace string.
*/
static ResourcePattern forExactNamespace(const NamespaceString& ns) {
return ResourcePattern(matchExactNamespace, ns);
}
/**
* Constructs a pattern that never matches.
*/
ResourcePattern() : _matchType(matchNever) {}
/**
* Returns true if this pattern matches only exact namespaces.
*/
bool isExactNamespacePattern() const {
return _matchType == matchExactNamespace;
}
/**
* Returns true if this pattern matches on the database name only.
*/
bool isDatabasePattern() const {
return _matchType == matchDatabaseName;
}
/**
* Returns true if this pattern matches on the collection name only.
*/
bool isCollectionPattern() const {
return _matchType == matchCollectionName;
}
/**
* Returns true if this pattern matches the cluster resource only.
*/
bool isClusterResourcePattern() const {
return _matchType == matchClusterResource;
}
/**
* Returns true if this pattern matches only any normal resource.
*/
bool isAnyNormalResourcePattern() const {
return _matchType == matchAnyNormalResource;
}
/**
* Returns true if this pattern matches any resource.
*/
bool isAnyResourcePattern() const {
return _matchType == matchAnyResource;
}
/**
* Returns the namespace that this pattern matches.
*
* Behavior is undefined unless isExactNamespacePattern() is true.
*/
const NamespaceString& ns() const {
return _ns;
}
/**
* Returns the database that this pattern matches.
*
* Behavior is undefined unless the pattern is of type matchDatabaseName or
* matchExactNamespace
*/
StringData databaseToMatch() const {
return _ns.db();
}
/**
* Returns the collection that this pattern matches.
*
* Behavior is undefined unless the pattern is of type matchCollectionName or
* matchExactNamespace
*/
StringData collectionToMatch() const {
return _ns.coll();
}
std::string toString() const;
inline size_t hash() const {
// TODO: Choose a better hash function.
return MONGO_HASH_NAMESPACE::hash<std::string>()(_ns.ns()) ^ _matchType;
}
bool operator==(const ResourcePattern& other) const {
if (_matchType != other._matchType)
return false;
if (_ns != other._ns)
return false;
return true;
}
private:
enum MatchType {
matchNever = 0, /// Matches no resource.
matchClusterResource = 1, /// Matches if the resource is the cluster resource.
matchDatabaseName = 2, /// Matches if the resource's database name is _ns.db().
matchCollectionName = 3, /// Matches if the resource's collection name is _ns.coll().
matchExactNamespace = 4, /// Matches if the resource's namespace name is _ns.
matchAnyNormalResource = 5, /// Matches all databases and non-system collections.
matchAnyResource = 6 /// Matches absolutely anything.
};
explicit ResourcePattern(MatchType type) : _matchType(type) {}
ResourcePattern(MatchType type, const NamespaceString& ns) : _matchType(type), _ns(ns) {}
MatchType _matchType;
NamespaceString _ns;
};
std::ostream& operator<<(std::ostream& os, const ResourcePattern& pattern);
} // namespace mongo
MONGO_HASH_NAMESPACE_START
template <>
struct hash<mongo::ResourcePattern> {
size_t operator()(const mongo::ResourcePattern& resource) const {
return resource.hash();
}
};
MONGO_HASH_NAMESPACE_END
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